Core



May 13, 1930. G. w. GILDERMAN 1,758,889

'cons Y Original Filed June 4. 1927 Patented May i3, 1930 1,758,88til EWNT OFFICE GEORGE W. GILDERMAN, OF MS-IAVJKJ,

TUBING CORPORATION, OF MIS-IA'WAK, NDAA, A

NEANA, ASSG-NOB'TO DODGE MANUFAC- CORORATON OF DELA'W'ARE CORE Original application :filed June 4, 1927, Serial No. 1967,7473.

1928. Serial This invention aims to provide an improved core for use in casting a hollow roll with integral end webs or integr l end webs and hubs.

ln the accompanying drawings i Fig. l is a central longitudinal section oi a core embodying the invention.

Fig. 2 is a side elevation thereof.

The core shown in the drawings represents ".2 one illustrative embodiment of the invention,

'. with the which in this instance is of a 'form suitable for a hollow roll casting with end webs embodying a concavo-convex shape and formed with inwardly extending hub portions.

ln the drawings l0 indicates the core generally, having the cylindricalV body portion 10a, with spaced end portions 10b. The end portions 10b are mainly spaced 'from the body portion 10a by recesses 10C, being connected to said body portion Vhowever by the hub portions 10d. rlhe recesses 10c are extended into the ends of the body portion 10 as indicated at l()Q to provide resultant recesses at the ends of the roll or roller cast use oic this core.

rlying or reinforcing rods ll extend through and between the body portion l()a and the end portions 10b, being located in the connecting hub portions i0 illustrated in Fig. l.

The core is constructed in any suitable manner, of any suitable material or composition, and is preferably partially dried and baked thereaiter to insure rigidity and adhesion, as well as proper shape. and dimensions.

rlhe end portions 10b provide for accurate positioning` ot the core body portion lOl in a mold with which it is used, suitable recesses in the mold being provided to accommodate the end portions 10", which thus in conjunction with the hub portions and the tying'rods l1 securely position and hold the body portion l0:L in spaced relation to the surrounding mold during casting. A longitudinal vent passage lOf is provided through the body ot the roll to permit the escape oi gases or the like.

A notch 10g is provided in one oi the body portions 10b for coaction with a positioning Divided and this application filed April 26, Ni. sienes.

lug in the mold with which the core is used, this insuring prop er longitudinal positioning ot' the core.

The inner faces oip the end portions l0" are shaped or formed to coact with the ad jacent ends oi? the body portion 10a to form the ends of the roller cast therefrom; in other words, the ends of such roll or roller are delined not only by the ends ot the core body portion l0?L but by the inner faces of the body portions l0", the intervening recesses being of the same cross sectional coniiguration and arrangement as the end webs or end webs und hubs of the-intended roll casting.

It will be seen that my invention provides a core on which a hollow roll can be cast with integral end webs or end webs and hubs the molding of which is determined wholly by the core itselt, thereby promoting accurate and uniform formation of the roll heads or ends as is desirable for a perfectly balanced roll. p

The invention contemplates an improvement in the production 01"' hollow cast conveyor rollers and the like by the utilization of cores embodying the invention in the casting of such rollers, which cores may be made in various forms suitable for hollow roll castings with dished or recessed ends or with their end webs jrormed with axially extending hubs.

ln making cores of the character described, I mold complemental longitudinal sections or halt parts of the intended core in suitable core boxes, and in the molding process I employ in the boxes semi-circular molding members corresponding in shape, arrangement and position to the intended core recesses, said members comprising segmental templates seated in the boxes so as to be capable of rotation about the core axis. After the molding ot' the core sections about the embedded templates, and striking olia or leveling the core material even with the faces of the boxes, the templates are removed by rotating them about the core axis, thus permitting subsequent release of the boxes from the core. The removal of the templates from the boxes may be accomplished, for example, by applying suitably apertured stripper plates over the open sides of the boxes, the apertures in the stripper plates registering With the ends of the templates, and then rotating the templates by pushing on one end with a suitable drift or tool inserted through one of the stripper plate openings so that the templates will pass out through the other openings. Then, the stripper plates and templates being removed, and a suitable adhesive material being sprinkled over the faces of the core sections to be joined, the core sections are united by bringing the core boxes into proper uxtaposition to hold the core sections accuratelly in contact face to face, and maintaining such contact until the adhesive binds them together.

A core making methd embodying the above practice is more fully described, in connection with apparatus for carrying out the same, in my application Serial No. 196,- 473, filed J une d, 1927, of which this application is a division; which said method is the subject matter of my divisional application Serial No. 273,037, filed April 26, 1928, while the .said apparatus or means employed is the subject matter of said parent application Serial No. 196,473.

What I claim is:

1. A core for coring a hollow roll casting, having integral extensions for exteriorly molding the ends of the cast-ing, said extensions rjoined to the main core body by central coring portions and having molding faces in fixed spaced relation to the ends of said main core body shaped to mold the ends of the casting in dished form, said molding faces and the confronting faces of the ends of the main core body beingcurved or inclined in the same general direction with reference to a plane at right angles to the core axis.

2. A core for coring a hollow roll casting, having integral extensions for exteriorly molding the ends of the casting, said extensions joined to the main core body by hub coring portions and having molding' faces in fixed spaced relation to the ends of said main core body, said ends of the main core body having recesses around the hub coring portions extending from the spaces between the said ends and extensions.

3. A core for coring a hollow roll casting, having integral extensions for exterior-lj;7 molding the ends of the casting, said exten sions having molding faces in spaced relation to the ends of the main core body and joined thereto by hub coring portions and the said ends of the main core body being recess-ec around the hub coring portions.

4. A core for use with a surrounding mold for casting a hollow roll with end webs and axially extending hubs, said core comprising a cylindrical main body portion having integral extensions by which it may be support-- ed in the mold, said extensions joined to the main body by hub coring portions and pro viding mold faces in fixed spaced relation to the ends of the main body for exterior-ly molding the ends of the casting, the spaces separating the main body from the extensions being of the configuration of said webs and hubs.

5. A core comprising a cylindrical body of sandy material having annular recesses providing end parts spaced from a main central part, with connecting hub parts of small diameter, and having' an axial vent passage and longitudinal reinforcing rods embedded in the material around said vent passage and extending from the main central part through the hub parts into the said end parts.

6. A core for coring a hollow roll casting, having integral extensions for exteriorly molding the ends of the casting, said extensions joined to the main core body by central coring portions and having molding faces in fixed spaced relation to the ends of said main core body shaped to mold the ends of the casting in dished form, said molding faces presenting annular bulging surfaces portions of which project axially beyond or overhang other portions nearer the said central portions.

7. A core for a roll casting formed with annular recesses providing surfaces in fixed spaced relation for molding end webs embodying a concavo-convex shape, the said recesses being correspondingly shaped.

8. A core for a roll casting formed with annular recesses providing surfaces in fixed spaced relation for molding end webs einbodying relatively deflected annular portions, the said recesses being of the shape of said webs and the confronting walls of said recesses accordingly embodying annular portions relatively deflected in the same general direction.

9. A core for a roll casting formed with annular recesses providing surfaces in fixed spaced relation for molding end webs of the casting, said recesses being formed to provide undercut portions of at least one wall of the recesses.

10. A core for a roll casting formed with annular recesses providing surfaces in fixed spaced relation for molding end webs of the casting, the walls of each of said recesses embodying confronting portions inclined in the same general direction with reference to a plane at right angles to the roll axisl 11. A core for a roll casting formed with annular recesses providing surfaces in fixed spaced relation for molding end webs of the casting, each of said recesses having a portion of a Wallunderlying a surrounding wall portion.

In testimony whereof, I have signed my name to this specification.

GEORGE YV. GILDERMAN. 

